Evaluation of Oxy-Coal Combustion Modelling at Semi-Industrial Scale
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1 Institute of Combustion and Power Plant Technology Prof. Dr. techn. G. Scheffknecht Evaluation of Oxy-Coal Combustion Modelling at Semi-Industrial Scale 6th Trondheim CCS Conference June 14-16, 2011, Trondheim, Norway M. Müller, U. Schnell, S. Grathwohl, J. Maier, G. Scheffknecht Institute of Combustion and Power Plant Technology, IFK, University of Stuttgart
2 Overview» Introduction» oxy-fuel process» modelling of coal combustion» Extended chemical reaction models» homogeneous chemistry» heterogeneous chemistry» Comparison of experiment and simulation» test facility and operating conditions» simulation results» Conclusions & Outlook 2
3 Overview» Introduction» oxy-fuel process» modelling of coal combustion» Extended chemical reaction models» homogeneous chemistry» heterogeneous chemistry» Comparison of experiment and simulation» test facility and operating conditions» simulation results» Conclusions & Outlook 3
4 Oxy-fuel process» Specific conditions within oxy-fuel combustion process compared to conventional operation» modified composition of oxidizing atmosphere (mainly oxygen and recycled flue gas)» thermo-physical properties» flame characteristics» emission behaviour» adjustments are required within CFD simulations 4
5 Modelling of coal combustion» In-house developed CFD code» specifically tailored for combustion simulation combining» fluid flow» heat transfer» chemical reactions 5
6 Modelling of coal combustion» Conversion process of pulverized coal combustion» pyrolysis: primary and secondary reactions» burnout of residual char» combustion of volatile gases ash char raw coal char volatile gases volatile gases flue gas (CO 2, H 2 O, )» objective of simulations:» prediction of flow field, temperature distribution and relevant species concentrations 6
7 » Introduction» oxy-fuel process» modelling of coal combustion» Extended chemical reaction models» homogeneous chemistry» heterogeneous chemistry» Comparison of experiment and simulation» test facility and operating conditions» simulation results» Conclusions & Outlook 7
8 Extended chemical reaction models» Homogeneous chemistry (volatile combustion): (1) C n H m + n/2 O 2 n CO + m/2 H 2 (2) C n H m + n H 2 O n CO + (m/2 +n) H 2 (3) H 2 + ½ O 2 H 2 O (4) CO + H 2 O CO 2 + H 2» implementation of additional reactions and considering equilibrium reactions enables accounting for chemical effects of specifically high O 2 and CO 2 levels in the oxidizing atmosphere during oxy-fuel combustion» including reverse reaction of (3) is particularly required for correct prediction of local flame temperatures since equilibrium is shifted towards educts in high temperature flames 8
9 Extended chemical reaction models» Heterogeneous chemistry (char burnout): (1) C + ½ O 2 CO (char oxidation) (2) C + CO 2 2 CO (Boudouard reaction) (3) C + H 2 O CO + H 2 (water-gas-shift reaction)» gasification reactions (2) and (3) may have major impact in O 2 -lean regions due to higher partial pressures of CO 2 and H 2 O compared to conventional air-firing» at ambient pressure and typical combustion temperatures the reactions (2) and (3) may be considered irreversible since the equilibrium is shifted towards the product side 9
10 » Introduction» oxy-fuel process» modelling of coal combustion» Extended chemical reaction models» homogeneous chemistry» heterogeneous chemistry» Comparison of experiment and simulation» test facility and operating conditions» simulation results» Conclusions & Outlook 10
11 Experimental set-up» Atm. pulverized coal combustion rig» maximum thermal input 500 kw th» vertically fired furnace with» length: ~ 7.0 m» diameter: ~ 0.8 m in-flame measurements Level Inlet: - carrier gas + coal - combustion gas - pre-heated air / RFG» oxy-fuel operation:» dry/wet flue gas recycling» O 2 from external storage tank continuous exhaust gas measurements Outlet 11
12 Experimental set-up» Burner layout:» four oxidizer inlets highly flexible operation» swirl imposed in outer annular section surround 2» bluff body included for mixing and stabilization core coal surround 1 surround 2 surround 3 12
13 Experimental set-up» Burner layout:» four oxidizer inlets highly flexible operation» swirl imposed in outer annular section surround 2» bluff body included for mixing and stabilization» computational mesh:» detailed grid with about 2.2 x 10 6 cells 13
14 Experimental set-up» Operational conditions:» oxy-fuel and air case» fuel: hard coal Pittsburgh #1 core : Air Coal/Carrier Gas : Air» thermal input: ~ 280 kw th» oxy-fuel test case: surround 1 : surround 2 : surround 3 : Air Air Air» direct injection of O 2» wet flue gas recycling» total O 2 level: ~ 32 %» recycling rate: ~ 75 % core : RFG* Coal/Carrier Gas : CO 2 surround 1 : RFG* surround 2 : surround 3 : RFG* Oxygen 14
15 Evaluation» Oxy-fuel test case simulation results 15
16 Evaluation» Oxy-fuel test case comparison» axial plots on furnace centerline» gas temperature: O 2 concentration: 16
17 Evaluation» Oxy-fuel test case comparison» axial plots on furnace centerline» CO concentration: CO 2 concentration: 17
18 Evaluation» Oxy-fuel test case comparison» radial plots at 0.18 m below the burner (level 2)» gas temperature:» O 2 and CO 2 concentration: 18
19 Evaluation» Oxy-fuel test case comparison» radial plots at 0.33 m below the burner (level 3)» gas temperature:» O 2 and CO 2 concentration: 19
20 » Introduction» oxy-fuel process» modelling of coal combustion» Extended chemical reaction models» homogeneous chemistry» heterogeneous chemistry» Comparison of experiment and simulation» test facility and operating conditions» simulation results» Conclusions & Outlook 20
21 Conclusions & Outlook» Evaluation of extended chemical reaction models against experiments at IFK s 500 kw th test facility» oxy-fuel case» air-fired case» fundamental trends agree in both operation modes improved reaction mechanisms work fine» deviations are identified in near burner zone» simulations predict ignition too late» temperature, CO levels too low and delayed O 2 consumption flow field and mixing behaviour of particular burner design??? 21
22 Conclusions & Outlook Next steps:» extensions regarding emission behaviour at oxy-fuel combustion conditions» nitrogen chemistry (NO x )» sulphur chemistry (SO x )» further validation against various facilities required» 20 kw th once through furnace (IFK)» 500 kw th test rig (IFK) operated with staged flame» 30 MW th oxy-fuel pilot plant at Schwarze Pumpe 22
23 Thanks to all the colleagues involved in this study! Special thanks for the project funding to: Alstom Power Systems GmbH EnBW Kraftwerke AG Thank you for your attention! 23
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